Speaker - Celestion, 12", T.F. Series 1225E, 300W, 8Ω

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Speaker - Celestion, 12", T.F. Series 1225E, 300W, 8Ω

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T.F. Series 1225E is a high powered 12" speaker suitable for many PA applications and in 2-way and compact 3-way systems. This bass and mid range driver has an extended low frequency response and features an edge wound voice coil for high efficiency and power handling.

RoHS Compliant
Item ID:
CelestionCelestion T.F. Series
Product Measurements
Chassis TypePressed steel
Coil MaterialEdge-wound copper
Cone MaterialKevlar-loaded paper
Cut-out Diameter283 mm
D260 mm
Diameter12 in.
Diaphragm/Coil Mass (Mmd)46.31 g
Electrical Q Factor (Qes)0.44
Equivalent Acoustic Volume (VAS)50.6 liters
Force Factor (BxL)15.41 Wb/m
Former MaterialPolyimide
Frequency Range50 Hz - 3,000 Hz
Gap Depth8 mm
Magnet TypeFerrite
Magnet Weight50 oz.
Maximum Linear Displacement (XMAX)3.5 mm
Mechanical Compliance (CMS)0.13 mm/N
Mechanical Moving Mass (MMS)53.24 g
Mechanical Q Factor (QMS)4.80
Mechanical Resistance of Driver (Rms)4.27 kg/s
Mounting Hole Bolt Circle Diameter297 mm
Mounting Hole Diameter7.9 mm
Mounting Slots4
Nominal Diameter12 in.
Nominal Impedance8 Ω
Overall Depth139 mm
Overall Diameter309 mm
Power Rating300 Wrms
Resonance Frequency (ƒS)61.2 Hz
Sensitivity96 dB
Surround MaterialCloth-sealed
Total Q Factor (QTS)0.40
Voice Coil DC Resistance (Re)5.07Ω
Voice Coil Diameter2.5 in.
Voice Coil Inductance @ 1 kHZ (LE)1.1 mH
Voice Coil Winding Width14.5 mm
Packaging Information
Packaging Dimensions12.875 in. × 13.375 in. × 6.25 in.
Weight (Packaging)11 lbs.

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Specifications, Files, and Documents

PDF: Specification Sheet Specification Sheet146.37 KB

Questions and Answers

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Asked by Anonymous on June 13th, 2018.
June 13th, 2018
Staff Member
We advise doubling the wattage of the amp with the speaker. For your amp that would be around 1100W. A 600W speaker technically has enough power for the amp, it is much more likely to be damaged when playing at higher volumes. Subsequently, the Ohm rating of the speaker is 8 Ohms while the amp's rated at 4 Ohms. It is safe to install an 8 Ohm speaker your amp as you can safely go over in Ohm ratings, just not under.

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